X0306 4 2021-01-04 0 0001018963 ALLEGHENY TECHNOLOGIES INC ATI 0001776844 Harris Timothy J C/O ALLEGHENY TECHNOLOGIES INCORPORATED 1000 SIC PPG PLACE PITTSBURGH PA 15222 0 1 0 0 Senior VP and CDIO Common Stock, par value $0.10 per share 2021-01-04 4 A 0 37436 0.00 A 74575 D Award of restricted stock units, which are settled in shares of stock upon vesting. The award vests in three equal annual installments on each of the first three anniversaries of the grant date. /s/ Amanda J. Skov, Attorney-in-Fact for Timothy J. Harris 2021-01-06